Comparing Languages

COMP360

“ Java is to JavaScript what Car is to Carpet. ”

Chris Heilmann

Course Evaluation

•Please complete the course evaluations for all classes

• You can find a link to the course evaluations on Blackboard

• So far only one person has completed the evaluation

Recursion

•A slide I copied from the textbook last week said

Recursion is equally powerful to iteration

•Actually recursion is more powerful than iteration

•Any iteration can be solved with recursion

•Not every recursive algorithm can be solved with iteration

Ackermann function

• The Ackermann function cannot be solved by iteration

It Gets Big Fast

m\n 0 1 2 3 4 n

0 1 2 3 4 5

1 2 3 4 5 6

2 3 5 7 9 11

3 5 13 29 61 125

4

13

=

65533

=

265536 − 3

=

=

=

Comparing Languages

• Today I would like to discuss the difference between programming languages that we know

Java

C++

JavaScript

Haskell

Overview of C++ and Java

C++

•An object-oriented extension of C leaving all old C features (and warts)

• Little inheritance in the standard library

Java

• Strongly influenced by C++

• Everything inherits from a single parent class, Object

Connection to the Hardware

C++

•Compiles to native machine language

• Length of data values dependent on implementation

• Supports unsigned numbers

Java

•Compiles to byte codes

• Standardized data length

•All numbers are signed

Programming Paradigms

C++

•Procedural

•Object-Oriented

•Generic

• Functional

Java

•Procedural

•Object-Oriented

•Generic

• Functional

•MapReduce

Program Safety

C++

•No bounds checking

•Dynamic memory released via delete

•Allow operator overloading

• Supports goto

Java

•Bounds checking on all array access

•Garbage collection

•Operator overloading is not allowed

• goto is not allowed (reserved word)

Object Instantiation

C++

•Widget cat; creates a Widget object

• Supports pointers

Java

•Widget cat; creates a reference to a Widget object

•Reference variables are pointers, but pointer manipulation is not allowed

Comparison on Wikipedia

https://en.wikipedia.org/wiki/Comparison_of_Java_and_C%2B%2B

Third Exam

•When should we have another exam in COMP360?

Course Evaluation

•Please complete the course evaluations for all classes

• You can find a link to the course evaluations on Blackboard

• So far only one person has completed the evaluation